1981 Xj550 Maxim Major Pita

Build duration: close to 1.5 years
Original bike has 22k miles on it
Currently still missing side covers that I will custom make
Tank badges still missing
Carb rebuild done by Dave (hogfiddles)
Engine is stock and only done shims and cam chain tensioner reset
Engine painted with high temp paint
Clutch untouched as it still works well
Exhaust cleaned with 000 steel whool
All bolts and nuts original, just cleaned and polished
Lots of other parts replaced, like wheel bearings, steering bearings, gaskets, cables etc
Most replacement parts from Len


Things I have learned (in no particular order), and other advice:

It's a must to be a forum member and listen to advice
Get a manual. Paper copy is great for notes
Test tank for leaks even when there is already a coating inside
Don't buy parts spontaneously, you end up not using them
Be patient
Put the bike together to make sure you didn't forget anything and/or everything fits, THEN take it apart again and have it painted
Take your time, no rush and no shortcuts
Buy parts from a trusted source who actually knows the bike
Don't try to save on tools that are made for the job. They make things so much easier
Be patient
It's sometimes better to let a pro do a job
It's a hobby, don't expect to get your money back when you sell the bike
Make sure engine runs fine before modding the bike
Buy a motorcycle table lift and a stool
Label everything
Be patient
Take a ton of pictures. They help when it's time to assemble the bike again
Wear gloves and eye protection when dealing with cleaners or other tools
Use a grease gun to get the brake piston out, not air
be patient
When you like riding bikes, make sure you have a second bike around because your project may not go anywhere for a long time
I would have never thought how much the sound (engine) and behavior of the bike depend on well adjusted carbs-it changes the bike completely
Don't throw any parts out
I like to use websites (like bikebandit.com) that show exploded views of different parts/sections of the bike. This helps in assembly to make sure you don't forget anything.
Did I mention that you need to be patient?
Carbs don't like to sit in the dry for a lon time. Not good for them. Sometimes tapping them unstucks a float
Cover any openings like spark plug holes, carbs, engine intake. Nuts and bolts always seem to fall right into the most impossible holes.

Hope this helps